Notify leaving users of pending sync

Notify a leaving user of pending sync.

On the editor, when closing the tab/browser you’re notified if you made changes and didn’t save them (image below - in portuguese, sorry). You still can leave, but it is a 2 step action to make sure you’re aware of that. That would be nice if this also worked for the app itself.

The delayed sync is a very useful (and necessary) feature, but some users unintentionally close the browser/tab before the app is done syncing. I also have this problem on mobile devices, but I’m not sure how this notification would work on a device.

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Status Open
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